Today Namco Bandai opened a new teaser site for the little known Denjarasu Jii-san Jya. It's a 3DS game based around the manga Grandpa Danger, which features in the monthly Japanese manga publication CoroCoro magazine.

Grandpa Danger's teaser site features a trailer, which doesn't shed any light on the game, but does help explain why you've probably never heard of the series in the first place.